//
//  UIApplication.swift
//  VDS
//
//  Created by Matt Bruce on 4/14/23.
//

import Foundation
import UIKit

extension UIApplication {
    
    /// Helper method to find the top most viewcontroller in the app
    /// - Parameter controller: UIViewController to test against
    /// - Returns: Found top most UIViewController 
    public class func topViewController(controller: UIViewController? = UIApplication.shared.windows.first?.rootViewController) -> UIViewController? {
        
        if let nav = controller as? UINavigationController {
            return topViewController(controller: nav.visibleViewController)
        }
        
        if let tab = controller as? UITabBarController {
            if let selected = tab.selectedViewController {
                return topViewController(controller: selected)
            }
        }
        
        if let presented = controller?.presentedViewController {
            return topViewController(controller: presented)
        }
                                     
        return controller
    }
}